Cost Per Reach Calculator
Two campaigns can spend the same $1,000 and put your ad in front of wildly different numbers of people. Cost per reach prices the person, not the view: it divides what you spent by the number of unique people who saw the ad at least once.
Enter the total campaign cost and the total reach from your ad platform. The calculator returns the cost of reaching one unique person, to four decimal places, because at awareness-campaign prices the difference between $0.0200 and $0.0250 is the whole story.
How it was calculated
Reach is a platform estimate, and each platform counts its own users. Reach from two platforms cannot simply be added together, because the same person often appears in both.
Quick Answer
- Quick Answer
- How to use the cost per reach calculator
- Reach counts people, impressions count views
- The formula, and the per-1,000 naming trap
- Worked example: a $1,000 awareness buy, and four comparisons
- Where reach numbers come from, and why they are estimates
- What competing calculators miss
- When cost per reach is the right metric, and when it is not
- Frequently Asked Questions
- Add This Calculator to Your Website
- References
How to use the cost per reach calculator
Take the two figures from the same campaign and the same date range. The cost is in your ad account or invoice: what the campaign spent in total. The reach is the platform's reach column, the count of unique people, not the impressions column sitting next to it.
Enter both, press Calculate, and read the result per person. The figure is shown to four decimal places on purpose: awareness media is cheap per person, and rounding $0.0200 and $0.0249 both to $0.02 would hide a 25% efficiency gap between two campaigns. Compare like with like: same platform, similar audience size, similar campaign length. A small, tightly targeted campaign will almost always cost more per person reached than a broad one, and that is a targeting choice, not automatically a failure.
Reach counts people, impressions count views
This is the distinction the whole metric stands on. Reach is unique people; impressions are total views, repeat views included.
Reach: unique people
50,000 peopleOne person who saw the ad five times still counts once. Reach answers: how wide did the message actually spread? It is the denominator in this calculator.
Impressions: total views
125,000 viewsThat same person counts five times. Impressions answer: how much exposure was delivered in total? Dividing cost by impressions instead gives cost per impression, a different metric.
The ratio between the two is frequency: impressions divided by reach. In the figures above, 125,000 impressions over 50,000 people is a frequency of 2.5, meaning the average person saw the ad two and a half times. The Klipfolio guide to Facebook Ads impressions and reach makes the same point for Meta campaigns: when impressions climb while reach stays flat, the same people are being shown the ad again. If your question is what each view cost rather than what each person cost, the cost per impression calculator is the right tool, and the click-to-reach ratio calculator covers how many of the people reached went on to click.
The formula, and the per-1,000 naming trap
One division, with unique people on the bottom.
The trap is that the industry uses this metric's name at two different scales. Some dashboards and KPI libraries define cost per reach with a multiplication by 1,000 built in, so their "cost per reach" is really a cost per thousand reached, closer to what others call CPM-U or cost per mille reached. Neither side is wrong, but the figures differ by a factor of 1,000, and comparing a per-person $0.0200 from this calculator against a per-thousand $20.00 from a dashboard, as if one campaign were a thousand times cheaper, is an error that turns up in real reports. This calculator always reports per single person. Check the scale before you compare any two figures, including any benchmark a platform or article quotes you.
Worked example: a $1,000 awareness buy, and four comparisons
The calculator is pre-filled with a $1,000 campaign that reached 50,000 unique people, and it returns $0.0200 per person. The table below runs the same formula over four more buys so you can see how the figure moves: doubling the spend while reach stays flat doubles the cost per person, and cheap reach usually comes from a broader audience, not a better ad.
| Campaign | Total cost | Unique reach | Cost per reach |
|---|---|---|---|
| Worked example: video awareness buy | $1,000 | 50,000 | $0.0200 |
| Local social campaign | $500 | 25,000 | $0.0200 |
| Narrow professional audience | $2,000 | 40,000 | $0.0500 |
| Broad national promotion | $750 | 150,000 | $0.0050 |
| Premium placements, same reach as the example | $3,000 | 50,000 | $0.0600 |
Read the last two rows together. The national promotion reaches a person for half a cent and the premium buy needs six cents, twelve times more, yet the premium buy may still be the right spend if its audience is the one that buys. Cost per reach ranks how cheaply you bought an audience. It says nothing about whether that audience was worth buying.
Where reach numbers come from, and why they are estimates
No platform counts reach by hand. Meta labels reach an estimated metric, calculated from sampled and de-duplicated data, a point Jon Loomer's breakdown of Meta's metric labels documents from Meta's own announcements. Google reports reach for video and Demand Gen campaigns on its own basis, and an influencer's "reach" is usually a follower count adjusted by a guess about how many followers saw a post.
Two working rules follow. First, treat the third and fourth decimal places as precision about the division, not about the audience: the arithmetic is exact, the reach input is an estimate. Second, never add reach across platforms. A person who saw the campaign on Instagram and again on YouTube is one person and two platform reaches, so a summed figure overstates the audience and understates the true cost per unique person. Within one platform and one account, the comparisons this calculator is built for are sound.
What competing calculators miss
The competing tools reviewed for this page, from Calculator Ultra and Brave Calculator down to the KPI libraries, mostly get the division right and everything around it wrong or missing.
Miss 1: no scale warning. Bare tools return a number with no statement of whether it is per person or per thousand, even though, as the DashThis cost per reach KPI page shows, published formulas for this exact metric include the x1,000 variant. A result you cannot place on a scale is a result you cannot compare.
Miss 2: impressions quietly swapped for reach. At least one tutorial site prints the formula as cost per reach = total ad spend / total impressions. That is cost per impression wearing the wrong label, and on a campaign with a frequency of 2.5 it understates the cost of reaching a person by two and a half times.
Miss 3: two-decimal rounding. General calculators that round currency to cents report every efficient awareness campaign as $0.02 or $0.05 and erase the differences between them. Four decimal places is not pedantry at this scale; it is where the comparison lives.
Miss 4: a "good" figure with no context. Several guides quote a single good cost per reach range for a whole platform. Audience size, targeting tightness, and geography move this metric more than ad quality does, so a universal range mostly measures who your audience was. This page gives you the comparisons and the caveats instead of a verdict that cannot survive contact with a niche audience.
When cost per reach is the right metric, and when it is not
Use cost per reach when
- The campaign goal is awareness: a launch, a new market, a name people should recognize later.
- You are comparing channels or placements for the same audience and period.
- You are planning a budget and need a defensible cost for each block of 1,000 people.
- Frequency is creeping up and you want to price what wider delivery would cost instead.
Do not judge by it when
- The campaign exists to sell. A cheap reached person who never clicks is worth less than a costly one who buys.
- Audiences differ in intent: a cent of reach among likely buyers beats half a cent among everyone.
- You need an outcome metric. Pair reach with the cost per click calculator for the next step, and the cost per purchase calculator for the step that pays.
The funnel reading is the honest one: cost per reach prices the audience, cost per click prices the interest, and cost per purchase prices the sale. The OWOX cost per reach guide makes the same placement, treating it as an exposure-efficiency metric for comparing channels. Judge each campaign at the step it was bought for, and use this figure to keep the top of the funnel honest, in a market the IAB Internet Advertising Revenue Report shows still growing across social and video.
Frequently Asked Questions
Cost per reach is the average cost of putting your ad in front of one unique person: total campaign cost divided by total reach. A $1,000 campaign that reached 50,000 unique people has a cost per reach of $0.0200 per person.
Reach counts unique people who saw the ad at least once. Impressions count every view, including repeat views by the same person. A campaign with 50,000 reach and 125,000 impressions showed its ad to 50,000 people an average of 2.5 times each.
No. CPM is the cost per 1,000 impressions, and impressions include repeat views. Cost per reach is priced per unique person. Multiply this calculator's result by 1,000 and you get the cost per 1,000 unique people reached, which is the reach-based figure closest to CPM.
Because the name is used at two scales. Some dashboards define cost per reach per 1,000 people reached and build the x1,000 into the formula; this calculator reports per single person. The two figures differ by a factor of 1,000, so check the scale before comparing any two values.
There is no universal good figure. Broad audiences on social platforms can cost well under a cent per person, while narrow professional or local audiences can cost several cents, and both can be right for their goal. Compare against your own past campaigns on the same platform and audience type first.
Not reliably. The same person often appears in both platforms' reach counts, so adding them overstates the unique audience and makes your cost per reach look better than it is. Calculate each platform separately, or use a de-duplicated cross-platform reach figure if your reporting tool provides one.
Broaden the audience, widen placements, or reduce wasted frequency: budget spent showing the ad a sixth time to the same people buys no new reach. Creative that earns shares and saves also stretches reach beyond the paid audience. Check the figure after each change rather than chasing the lowest possible number, because the cheapest reach is rarely the audience that buys.
Add This Calculator to Your Website
References
- Klipfolio, "Facebook Ads Impressions and Reach" - reach as the number of unique people who saw an ad at least once, against impressions as total views including repeats. Klipfolio: Facebook Ads Impressions and Reach. Accessed October 2026.
- Jon Loomer Digital, "Facebook Ad Metrics Updates: Clarification and Removal" - Meta's own description of reach as an estimated, sampled, de-duplicated metric. Jon Loomer: Facebook Ad Metrics Updates. Accessed October 2026.
- DashThis, "What is cost per reach (CPR) and how to calculate it" - the per-1,000 variant of the cost per reach formula, cited here for the naming-scale distinction. DashThis: Cost per reach. Accessed October 2026.
- OWOX, "Cost Per Reach" - cost per reach as an exposure-efficiency metric for comparing campaign channels. OWOX: Cost Per Reach. Accessed October 2026.
- Climb The Ladder, "How to Calculate Cost Per Reach: The Formula and Strategy" - the per-person formula and its scaling to cost per 1,000 unique individuals (CP1K Reach). Climb The Ladder: How to Calculate Cost Per Reach. Accessed October 2026.
- Interactive Advertising Bureau, "Digital Ad Revenue Climbs to Nearly $300B" - the IAB Internet Advertising Revenue Report release, on social and video growth in digital advertising. IAB: Digital Ad Revenue Climbs to Nearly $300B. Accessed October 2026.